Is the third testimony a part of Adhan and Iqamah?

Answer

Ash hadu anna Amiral Mu'minina 'Aliyyan Waliyyullah ( I testify that the Commander of the faithful, Imam Ali (AS) is the vicegerent of Allah) is not a part of Adhan and Iqamah, but it is good to say it after reciting Ash hadu anna Muhammadan Rasulul lah with the intention (Niyyat) of Qurbat (seeking nearness to Allah).